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Help CenterSteel Pipe & Tube & Precision Steel Tube，10#、20#、35#、45#、St37、St52、16Mn、40Cr、20CrMo、42CrMo
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1. Product Overview
Precision steel tubes are high-precision seamless tubes manufactured by cold drawing and cold rolling processes, made of high-quality carbon steel and low alloy steel. After precise sizing and bright annealing, they feature tighter dimensional tolerance and smoother inner & outer surface than ordinary hot-rolled tubes. With uniform wall thickness and oxide-free inner bore, they can be directly assembled without secondary machining, widely used as precision pressure-bearing parts for hydraulic machinery and construction equipment.
Application Scenarios
Hydraulic cylinder barrels, piston rod liners, precision pneumatic pipelines, auto chassis parts, precision shaft sleeves for construction machinery, transmission tubes for machine tools, high-pressure hydraulic systems, agricultural machinery fittings, general mechanical precision structural parts.
Delivery Lead Time
Standard spot sizes can be delivered within 5-7 days; customized tubes with special wall thickness, custom lengths or alloy grades take 10-15 days, shipped in full containers from Tianjin Port.
2. Standards & Common Steel Grades
Domestic Standards
GB/T 3639 Cold Drawn & Cold Rolled Precision Seamless Steel Tubes, GB/T 8162 Structural Seamless Tubes, GB/T 8163 Fluid Transportation Tubes
International Standards
DIN2448, DIN2391, EN10305, ASTM A519
Common Grades (Carbon & Low Alloy Steel)
Carbon steel: 10#, 20#, 35#, 45#, St37, St52Alloy steel: 16Mn, 40Cr, 20CrMo, 42CrMo
3. Specifications
Outer Diameter: Φ6mm–Φ120mm
Wall Thickness: 0.8mm–25mm
Standard Length: 3m, 6m, 9m, custom lengths available
Dimensional Tolerance: OD tolerance ±0.03~±0.08mm, wall thickness tolerance within ±0.05mm
Pipe End: Plain ends, chamfered ends, beveled ends upon request
4. Manufacturing Process
High-quality round billet heating & piercing → hot rolled mother tube → pickling, phosphating & lubricating → multi-pass cold drawing / cold rolling → bright annealing → straightening → internal & external polishing & grinding → non-destructive testing → precise dimension reinspection → anti-rust treatment & packingLow-temperature bright annealing is adopted throughout production to eliminate oxide scale and guarantee stable mechanical properties and dimensions.
5. Key Performance Advantages
Ultra-high dimensional precision: Minimal tolerance on OD, ID and wall thickness, saving customers turning and boring processing cost
Smooth burr-free inner & outer surface: Low flow resistance for hydraulic fluid, less impurity accumulation
Balanced mechanical performance after annealing: Excellent ductility for flaring, flattening and welding
Stable pressure resistance: Compact tube wall without lamination or cracks, suitable for high & low pressure hydraulic sealing systems
Clean surface: Bright annealed finish without black oxide, attractive appearance and good rust resistance during assembly
6. Full Inspection for Every Tube
Spectral chemical composition test for raw material
Mechanical tests: tensile, hardness and low-temperature impact test
Formability tests: flaring and flattening test
UT ultrasonic & ET eddy current NDT to detect internal and surface cracks & lamination
Precision dimension measurement by micrometer for OD, ID and wall thickness
Hydrostatic tightness test for hydraulic pipesComplete documents are supplied together with goods: material test certificate, dimension inspection report and NDT qualification report.
Quality Warranty
Full return and replacement available for defective products caused by unqualified material, out-of-tolerance dimension or surface flaws.
7. Surface Treatment & Packing
Surface finish: Bright annealed finish, pickled lubricated finish; oxide scale fully removed inside and outside
Anti-rust treatment: Special anti-rust oil coated on inner and outer tube walls
Packing: Plastic dust-proof end caps on both sides, bundled with steel strips, wrapped with waterproof tarpaulin to avoid collision and moisture rust during sea transportation in containers.
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